Measuring device for inherent frequency of moving blade of steam turbine

The invention, which belongs to the field of steam turbine design, relates to a measuring device for the inherent frequency of a moving blade of a steam turbine, thereby a problem that the turbine accident is caused by blade breaking due to frequent low-pitch-diameter resonance of the actually processed moving blade when the inherent frequency of the moving blade can not be measured accurately andthus the turbine set can not work safely for long time. The measuring device comprises a radio telemetering system, a data storage and display analysis system, a compressed air excitation system anda rotational speed measuring system. The radio telemetering system is used for transmitting radio waves; the data storage and display analysis system is used for recording and analyzing the inherent frequency of the blade; the compressed air excitation system is used for exciting the moving blade; and the rotational speed measuring system is used for measuring the value of the rotational speed ofa rotor. The radio telemete